[C#]复数类，练习重载

using System;

namespace _07
{
    class Complex
    {
        private double m_dRealPart;
        private double m_dImagePart;

        public Complex(double dRealPart, double dImagePart)
        {
            m_dRealPart = dRealPart;
            m_dImagePart = dImagePart;
        }
        public Complex(double dRealPart)
        {
            m_dRealPart = dRealPart;
            m_dImagePart = 0;
        }
        public Complex()
        {
            m_dRealPart = 0;
            m_dImagePart = 0;
        }
        public Complex(Complex orig)
        {
            m_dRealPart=orig.m_dRealPart ;
            m_dImagePart=orig.m_dImagePart ;
        }

        static public Complex operator +(Complex op1,Complex op2)
        {
            Complex res = new Complex();
            res.m_dRealPart = op1.m_dRealPart + op2.m_dRealPart;
            res.m_dImagePart = op1.m_dImagePart + op2.m_dImagePart;
            return res;
        }
        static public Complex operator -(Complex op)
        {
            Complex res = new Complex();
            res.m_dRealPart = -op.m_dRealPart;
            res.m_dImagePart = -op.m_dImagePart;
            return res;
        }
        static public Complex operator -(Complex op1, Complex op2)
        {
            Complex res = new Complex();
            res = op1 + (-op2);
            return res;
        }
        static public Complex operator *(Complex op1, Complex op2)
        {
            Complex res = new Complex();
            res.m_dRealPart = op1.m_dRealPart * op2.m_dRealPart - op1.m_dImagePart * op2.m_dImagePart;
            res.m_dImagePart = op1.m_dImagePart * op2.m_dRealPart + op1.m_dRealPart * op2.m_dImagePart;
            return res;
        }
        static public Complex operator /(Complex op1, Complex op2)
        {
            Complex res = new Complex();
            double temp = op2.m_dRealPart * op2.m_dRealPart + op2.m_dRealPart * op2.m_dImagePart;
            res.m_dRealPart = (op1.m_dRealPart * op2.m_dRealPart + op1.m_dImagePart * op2.m_dImagePart) / temp;
            res.m_dImagePart = (op1.m_dImagePart * op2.m_dRealPart - op1.m_dRealPart * op2.m_dImagePart) / temp;
            return res;
        }

        public double GetRealPart()
        {
            return m_dRealPart;
        }

        public double GetImagePart()
        {
            return m_dImagePart;
        }

        public double NormSquare()
        {
            return m_dRealPart * m_dRealPart + m_dImagePart * m_dImagePart;
        }

        public override string ToString()
        {
            string res;
            if (m_dRealPart == 0 && m_dImagePart == 0)
            {
                res = "0";
            }
            else if (m_dRealPart == 0 && m_dImagePart != 0)
            {
                res = m_dRealPart.ToString();
            }
            else if (m_dRealPart != 0 && m_dImagePart == 0)
            {
                res = m_dImagePart.ToString() + "i";
            }
            else if (m_dImagePart > 0)
            {
                res = m_dRealPart.ToString() + "+" + m_dImagePart.ToString() + "i";
            }
            else
            {
                res = m_dRealPart.ToString() + m_dImagePart.ToString() + "i";
            }

            return res;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Complex a, b, c;
            a = new Complex(1, 2);
            Console.WriteLine("a = {0}", a.ToString());
            Console.WriteLine("Re(a) = {0}", a.GetRealPart());
            Console.WriteLine("Im(a) = {0}", a.GetImagePart());
            Console.WriteLine("|a|^2 = {0}", a.NormSquare());
            b = new Complex(3, -4);
            Console.WriteLine("a = {0}", b.ToString());
            c = new Complex(a);
            Console.WriteLine("c = a = {0}", c.ToString());
            Console.WriteLine("({0}) + ({1}) = {2}", a.ToString(), b.ToString(), (a + b).ToString());
            Console.WriteLine("({0}) - ({1}) = {2}", a.ToString(), b.ToString(), (a - b).ToString());
            Console.WriteLine("({0}) * ({1}) = {2}", a.ToString(), b.ToString(), (a * b).ToString());
            Console.WriteLine("({0}) / ({1}) = {2}", a.ToString(), b.ToString(), (a / b).ToString());

            Console.ReadKey(true);
        }
    }
}

/*
 * 学习手记
 * 
 * 没想到 C# 的重载跟 C++ 差那么多！
 * = 不能重载了
 * 也不用 this —— 这个倒明朗得多了
 * 
 * 2007-06-14
 */

 

（原发表于 CSDN：https://blog.csdn.net/cnStreamlet/article/details/1653001）